Hyundai Elantra: ESC(Electronic Stability Control) System / ESC Control Unit Repair procedures

Hyundai Elantra AD (2016-2020) Service Manual / Brake System / ESC(Electronic Stability Control) System / ESC Control Unit Repair procedures

Removal

1.	Turn the ignition switch OFF and then disconnect the negative (-) battery cable.

2.	Pull up the lock of the HECU connector (A) , then disconnect the connector.

Remove the brake fluid from the master cylinder reservoir with a syringe.

•	Be sure to completely remove foreign substances from around brake fluid reservoir and cap before opening the reservoir cap. If not, it may cause contamination of brake fluid and deterioration in braking performance.

•	Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.

Disconnect the brake tubes from the HECU by unlocking the nuts counterclockwise with a spanner.

Tightening torque:

12.7 ~ 16.7 N.m (1.3 ~ 1.7 kgf.m, 9.4 ~ 12.3 lb-ft)

Tightening torque:

18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m. 13.7 ~ 16.6 lb-ft)

5.	Disconnect connectors and then remove the bracket.

Loosen the HECU bracket bolts (A), then remove HECU and bracket.

Tightening torque :

16.7 ~ 25.5 N.m (1.7 ~ 2.6 kgf.m, 12.3 ~ 18.8 lb-ft)

Remove the 3 bolts, then remove the bracket from HECU.

Tightening torque :

7.8 ~ 9.8 N.m (0.8 ~ 1.0 kgf.m, 5.8 ~ 7.2 lb-ft)

Installation

1.	To install, reverse the removal procedure.

2.	Tighten the HECU mounting bolts and nuts to the specified torque.

3.	After installation, bleed the brake system. (Refer to ESP(Electronic Stability Program) System - "ESP System Bleeding")

4.	Conduct the Variant coding.

5.	Conduct the Auto Detected Sensor Calibration.

6.	Conduct the Longitudinal G Sensor Calibration.

Adjustment

Diagnosis procedure by using diagnostic device

As manual for diagnosis methods by using diagnosis device, the main contents are as follows:

Connect self-diagnosis connector(16pins) located in the lower of driver side crash pad to self-diagnosis device, and then turn the self-diagnosis device after key is ON.

Select the "vehicle model" and "ABS/ESC" on GDS vehicle selection screen, then select OK.

[Variant Coding]

[Auto Detected Sensor Calibration]

[Longitudinal G Sensor Calibration]

ESC Control Unit Components and Components Location

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ESC OFF Switch Description and Operation

Description 1. The ESC OFF switch is for the user to turn off the ESP system. 2. The ESC OFF lamp is on when ESP OFF switch is engaged. ...

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